Dental plugger



-(No Model.)

. F. S. AVIL.

I DENTAL PLUGGER. No. 605,171. Patented June 7,1898.

ATTORNEYS,

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UNITED STATES PATENT FFICE.

FRANCIS s. AvIL,' oF PHILADELPHIA, PENNsYLvANIA.

DEjNTA L PLUGGERQ s'PEoIr rcA'rIoN forming p r of LettersPatent No.05,171, dated June 7, 1898.

Application filed November 10,1897. seen 116 6573392. on model.)

To all whom'it may concern/. I u

Be it known'that LFRANOIS SQAVIL, a citizen of the United States,residing in" the city and county offPhiladelphia, State of Pennsylvania,have invented a new and useful Improvement in Dental Mallets,whichimprovement is fully set forth in the followingspecification andaccompanying drawings, I p

My invention consists. in adapting a dental mallet to be adjusted indifierent positions of a circle around the'casingor handpiece withoutnecessarily turning orhloving the latter or affecting the power whichoperates the mallet.

Figure 1 represents a longitudinal section of a dental malletembodyingmyinvention.

Fig. 2 represents a side elevation of the parts of the same removed fromthecasin'g or handpiece. Fig: 3 represents a "side elevation of thecasing thereof. Fig. 4 represents a side elevation of portion of thespindle of'the device.

Fig. 6 representsan end viewofthe casing. Fig. 7 represents'alongitudinal'section of a portion of. the nose of the device and-partsadjacent thereto on an enlarged scale. Fig. 8 represents a transversesection of a portion of the inner rim of the nose, a dog or catchtherein,'and'the adjacent end of fthe casing, whereby said nose maybeheld in either of the positions to which it mayberot'a'tede Fig. 9represents aperspecti've 'vie'w off adetached part.

Similarletters of reference indicate corresponding parts in" thefigures. Q j A Referring' tothe drawings, A designates acasingwithinwhieh is mounteithe; spindle B, to which powerfmay'beimparted in any suitable manner, said spindle being provided with thestem D,,which freely enters the open-' ing E in the plunger 0.Projecting from the stem D is the stud F, which freely enters thebifurcation ofthe neck -Gof a eollar H, which freely encirclessaid" stemD, contiguous to the end of the plunger C,theo'pposite faces of saidcollar. and plunger being helical, so as 'to interlock or couple "thespindle and plunger when'the spindle is rotated in one direction andpermit said collar to slide on said stem when the spindle is rotated inthe reverse direction. The plunger 0 has connected with it the stem J,which is thus capable of receivnut.

Fig. 5' represents a transverse section. on line mag-Fig. 1.

ing both rotary and reciprocating movement when the device is operated,said stem J bein g guided in the stationary nut K, the latterbeing'fscrewed into the casing A and'having amille'd rim L, which isaccessible outside of said. casing, so as to readily adjust said nut, itbeing noticed that the adjacent ends of the nut and plunger 0 arehelical and shouldered, so that when said plunger has made itsrevolution it'wi'll drop from the shoulder on said The plungerv thenreceives an advance motion with the power of a blowfby the action of thespring M, which I encircles the inner end of thespindle B and the'neck Gof the collar H and bears at one end against said collar and at theother end against the sliding collar N, which'freelyflencircles thespindle B and has wings P radiating theretudinally-extendingslots Qint'h'e ca'sing A,

said wings being screw-threaded and engaged by the sleeve P, whichencircles the slotted portion of the casing and serves whenrotated tomove the collar N, and'thereby; adjust the tension of the spring and thefforce'ofthe blow. When the spindle is rotatedin reverse orderand thecollar 11 rides'freely on the plunger, as has been stated',"' theplunger is held immovable, owin'g'to the engagement of the shouldersofjthe helical faces of said plunger and coupling-nut.

The nut K, which is struck by the plunger 0, acts as a stop for saidsection and limits the play thereof. Within the casing in front of thenut is the segmental plate R, which is 'mounted on said casing, and isprovided with the plunger 0 and so is' adaptcd to receive the blow ofthe latter. 7

T designates a collarwhioh has a flange on its periphery, the same beingfreely engaged by the flanged rim T the latter being screwed to thefront end'of the casing, thus retain-' the segmental plate W, which ispivotally' connected with said nose and has one side in the path ofmotion of the pin U, which freely occupies the boreor perforation ofsaid eollar '1, so as to be advanced by the said pin, the side of saidplate opposite to said pin being adapted to strike the head IV of theplugger-point X of the device, said head being fitted within said noseand pressed inwardly by the action of a spring suitably applied.

In the inner edge of the rim T is the springpressed dog or catch Y,which is adapted to enter either of the openings Z in the edge of thecasing A opposite to said rim, so as to lock the rim T and preventimproper rotation thereof as the nose is rotated.

The operation is as follows: The nose is turned on the casing so as tobring the point X to the desired position or degree in the circle saidnose may turn. As the spindle is rotated the plunger 0 is drawn back andthen dropped, it being noticed that said plunger slides on the stem 1),but remains connected therewith, owing to the stud F and bifurcated neckG, in which said stud is adapted to play. As the plunger drops its stemJ strikes the plate R and the latter strikes the pin U, and thus bymeans of the intervening segment or plate \V the blow is imparted to thepluggerpoint, the effect of which is evident.

XVhile the engine or motor is running the mallet may be renderedinoperative b Y pressing the thumb-piece S, whereby the segment It isremoved from the adjacent end or stem of the plunger, so that the latterwhile receivingitsreeiprocating motion is prevented from striking saidsegment.

The end of the casin g which forms the bearings of the nose isdeflected, so that said nose presents the mallet proper or tool thereinat an angle to the casing, and the angular position of the nose ispreserved at any part of the circle which the nose may describe in itsrotation on its casing.

Projecting from the head IV of the pluggerpoint is a stud or lug \Vwhich is adapted to enter the groove or recess on the inner face of theadjacent portion of the nose, whereby said head is prevented fromrotation either while screwing the plugger-point to said head or duringthe operation of the mallet.

Having thus described myinvention, what I claim as new, and desire tosecure by Letters Patent, is-

lar and rotatable therewith, a point or tool fitted to slide in saidnose-piece, a sliding pin in said collar, means for freely connectingsaid collar with said casing, a plunger, and means for transmitting ablow from said plunger to said pin and consequently to said point.

2. In a dental mallet, a casing, a perforated rotatable collar mountedin the outer end thereof, a nose-pieee secured to said collar androtatable therewith, a point or tool fitted to slide in said nose-piece,a sliding pin in said collar, swinging plates at opposite ends of saidpin in said nose and easing respectively, and a plunger, the latterbeing adapted to strike the plate in the casing.

In a dental mallet, a casing, a perforated rotatable collar mounted inthe outer end thereof, a nose piece secured to said collar and rotatabletherewith, a point or tool fitted to slide in said nose, a sliding pinin said collar, a flanged rim secured to said easing, a plunger, andmeans for transmitting a blow from said plunger to said pin and fromsaid pin to said point, said collar having a peripheral flange which isfreely engaged by said flanged rim.

t. In a dental mallet, having a casing, a nose rotatively mountedthereon, and amovable pin fitted in said casing, swinging plates atopposite ends of said pin, one plate being mounted on said casing andthe other plate being mounted on said nose, the plate on the casingbeing adapted to be engaged by the blow-delivery mechanism of thedevice, and furthermore adapted to be removed from the action of saidmechanism.

5. In a dental mallet, a swinging plate mounted in the casing, adaptedto be engaged bythe blow-delivery mechanism, and to transmit the blow tothe plugger-point or mallet proper, said plate having a linger-piecethereon, which may be engaged from outside of the casing to remove saidplate from the action of said mechanism and avoid the impartation of ablow or blows to said point.

FRANCIS AVIL.

\Vitnesses:

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